A comparative evaluation of the microhardness, water solubility and water absorption of fissure sealants

Microhardness studies on the setting characteristics of fissure sealants

“…The results reported here have confirmed the findings of Williams, Fraunhofer & Winter (1975) and Watkins (1975) that sealants continue to increase in hardness long after their initial setting. Nuva-seal, Alphaseal, Epoxylite 9075 and Concise Enamel Bond tended towards similar values in the range 10-20 kg/mm^ during the threemonth test period.…”

“…Ten such indentation measurements were made and the mean value used in the following formula to calculate the Woxen Hardness Number (Woxen, 1944).…”

“…A primary load of 0-001 kg was applied, and the increase in surface penetration by a standard Vickers diamond indentor, on adding a further load of 0-3 kg for 30 s, was measured to a precision of 0-25 ftm. Ten such indentation measurements were made and the mean value used in the following formula to calculate the Woxen Hardness Number (Woxen, 1944).…”

“…intensity applied, the wide variation found in the u.v. output of Nuva-lites could be a factor contributing to the variable retention found in different clinical trials (Young et al, 1977). The present study further examines the setting behaviour of these materials by considering the microhardness of three chemically setting, and two u.v.…”

Microhardness studies on the setting characteristics of fissure sealants

“…The results reported here have confirmed the findings of Williams, Fraunhofer & Winter (1975) and Watkins (1975) that sealants continue to increase in hardness long after their initial setting. Nuva-seal, Alphaseal, Epoxylite 9075 and Concise Enamel Bond tended towards similar values in the range 10-20 kg/mm^ during the threemonth test period.…”

“…Ten such indentation measurements were made and the mean value used in the following formula to calculate the Woxen Hardness Number (Woxen, 1944).…”

“…A primary load of 0-001 kg was applied, and the increase in surface penetration by a standard Vickers diamond indentor, on adding a further load of 0-3 kg for 30 s, was measured to a precision of 0-25 ftm. Ten such indentation measurements were made and the mean value used in the following formula to calculate the Woxen Hardness Number (Woxen, 1944).…”

“…intensity applied, the wide variation found in the u.v. output of Nuva-lites could be a factor contributing to the variable retention found in different clinical trials (Young et al, 1977). The present study further examines the setting behaviour of these materials by considering the microhardness of three chemically setting, and two u.v.…”

Microhardness studies on the setting characteristics of fissure sealants

“…The results reported here have confirmed the findings of Williams, Fraunhofer & Winter (1975) and Watkins (1975) that sealants continue to increase in hardness long after their initial setting. Nuva-seal, Alphaseal, Epoxylite 9075 and Concise Enamel Bond tended towards similar values in the range 10-20 kg/mm^ during the threemonth test period.…”

“…Ten such indentation measurements were made and the mean value used in the following formula to calculate the Woxen Hardness Number (Woxen, 1944).…”

“…A primary load of 0-001 kg was applied, and the increase in surface penetration by a standard Vickers diamond indentor, on adding a further load of 0-3 kg for 30 s, was measured to a precision of 0-25 ftm. Ten such indentation measurements were made and the mean value used in the following formula to calculate the Woxen Hardness Number (Woxen, 1944).…”

“…intensity applied, the wide variation found in the u.v. output of Nuva-lites could be a factor contributing to the variable retention found in different clinical trials (Young et al, 1977). The present study further examines the setting behaviour of these materials by considering the microhardness of three chemically setting, and two u.v.…”

Microhardness studies on the setting characteristics of fissure sealants

“…The results reported here have confirmed the findings of Williams, Fraunhofer & Winter (1975) and Watkins (1975) that sealants continue to increase in hardness long after their initial setting. Nuva-seal, Alphaseal, Epoxylite 9075 and Concise Enamel Bond tended towards similar values in the range 10-20 kg/mm^ during the threemonth test period.…”

“…Ten such indentation measurements were made and the mean value used in the following formula to calculate the Woxen Hardness Number (Woxen, 1944).…”

“…A primary load of 0-001 kg was applied, and the increase in surface penetration by a standard Vickers diamond indentor, on adding a further load of 0-3 kg for 30 s, was measured to a precision of 0-25 ftm. Ten such indentation measurements were made and the mean value used in the following formula to calculate the Woxen Hardness Number (Woxen, 1944).…”

“…intensity applied, the wide variation found in the u.v. output of Nuva-lites could be a factor contributing to the variable retention found in different clinical trials (Young et al, 1977). The present study further examines the setting behaviour of these materials by considering the microhardness of three chemically setting, and two u.v.…”